Outlook cannot connect to Exchange Server

We have strange things going on here. We are running Exchange 2003 on SBS. Periodically the Outlook Clients break the connection to the Exchange Server. Ager some minutes and restrating Outlook the Clients can connect to the server again.

Re: Outlook cannot connect to Exchange Server

Which source and ID has the error? Perhaps a Firewall (local) blocks the RPC Ports? A connection with the Exchange server, it use different RPC ports. These are between 1024 - 65xxx! Attempts test it with the Tool RPC Ping.

Hello,
This situation can be occurred when Exchange Server is overloaded and the Client access server RPC cannot checks the required services then the Exchange Server need to resolve this issue or you can resolve this issue by activating the cache mode this will minimize the exchange server subsequently.